Key Takeaways
- Bulk on an Android gateway is a paced queue through phones you own — not an unmetered cloud blast.
- Consent and E.164 parsing happen before the first row hits the radio. Excel stripping plus signs is a production bug.
- Size devices for the send window, raise OEM rate ceilings where allowed, and still respect carrier fair-use.
- STOP must land in the same store the campaign reads, even mid-blast.
- You bring phones and operator credit. Pricing is devices plus send volume — not a fake unlimited carrier SKU.
Searchers for android sms gateway for bulk sms usually have a spreadsheet and a deadline. The gateway will accept the file. The radios will not pretend they are a CPaaS interconnect. This long-tail is how you run a consented blast on SIMs without starving login OTP or lighting up spam filters.
Product: bulk SMS from Excel/CSV · bulk use case. You bring Android devices and airtime. We meter devices and send volume.
Paced queue
What bulk means on a SIM gateway
Many destinations, one campaign, your MSISDN on the lock screen. Throughput is phones × modem × operator, then the OEM’s SMS rate ceiling. Credits in a dashboard do not add radios.
If the plan is “dump the CSV at 21:00 on one handset,” the plan is a complaint. Pace it or buy more devices.
Pace, parts, and pools
| Lever | What to set | Failure if ignored |
|---|---|---|
| Device count | Peak rows / safe per-phone hour | Queue forever, OTP starved if shared |
| Encoding | GSM-7 one part when possible | 3× airtime, out-of-order parts |
| Suppression | E.164 unique STOP list | You re-text people who opted out |
| Window | Local quiet hours | Carrier filters + angry replies |
Load tests: load test carefully. Timezones: schedule by timezone.
CSV, consent, and E.164
Text column, plus prefix, parse report before send. Number formats. Consent is per program, not “we have a phone.” Blacklist management.
Live upload fields: Developer Center.
OEM ceilings and fair-use
Raising Android/OEM SMS rate ceilings is a tutorial topic. It does not delete operator caps or turn airtime free. Doze on a “batch phone” left unplugged will freeze the campaign overnight. Doze.
STOP during a blast
Inbound must be consumed while sending. A device that only transmits is a compliance hole. Auto-reply and STOP.
Never share the OTP radio
Isolate authentication devices. Failover the promo pool, not the login SIM. Failover.
Volume math
Operator cost × rows × parts × retries. Platform: Free 300 SMS lifetime; Developer 25,000 SMS/year; Starter / Professional / Business uncap platform send volume with 2 / 5 / 15 devices. Pause on Free/Developer when the allowance is exhausted. No silent overage.
Checklist
- Consent + E.164 parse report.
- OTP SIMs out of the campaign deviceIds.
- Pace written; spare charged phone.
- Staff canary 20 rows before the full file.
Next steps
Run 50 consented staff rows, watch DLR and STOP, then scale devices — not hope. Setup · downloads.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- bulk SMS from Excel and CSVSpreadsheet campaigns
- bulk SMS with consent best practicesHigh-volume outreach
- device and SMS volume pricingPlans and allowances
- Android SMS gateway product guideDefinition, product, and how to buy
